You know if you use a lot of clips, or clips in different formats, then the playing freezes, and you just get a blank screen? well, if you're computer-stupid like me, here's a somewhat easy (though time consuming) way around it. If you can not get it to play at all, or it's a repeat problem, save your AMV wip to your computer, as though it's a finished project. Then import it back into a new project window, split where neccessary, and continue. This worked for me, though I sometimes had to do this 5-10 times in a video. Takes a while, but saves a lot of frustration.